/*  EQEMu:  Everquest Server Emulator
    Copyright (C) 2001-2006  EQEMu Development Team (http://eqemulator.net)

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; version 2 of the License.
  
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY except by those people which sell it, which
	are required to give you total support for your newly bought product;
	without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
	
	  You should have received a copy of the GNU General Public License
	  along with this program; if not, write to the Free Software
	  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "debug.h"
#include "Condition.h"

#ifdef _WINDOWS
#else
#include <pthread.h>
#include <sys/time.h>
#include <errno.h>
#endif

#ifdef _WINDOWS


Condition::Condition() 
{
	m_events[SignalEvent] = CreateEvent (NULL,  // security
                                     FALSE, // is auto-reset event?
                                     FALSE, // is signaled initially?
                                     NULL); // name
	m_events[BroadcastEvent] = CreateEvent (NULL,  // security
                                     TRUE, // is auto-reset event?
                                     FALSE, // is signaled initially?
                                     NULL); // name
	m_waiters = 0;
	InitializeCriticalSection(&CSMutex);
}

Condition::~Condition()
{
	DeleteCriticalSection(&CSMutex);
	CloseHandle(m_events[SignalEvent]);
	CloseHandle(m_events[BroadcastEvent]);
}

void Condition::Signal()
{
	EnterCriticalSection(&CSMutex);
	if(m_waiters > 0)
		SetEvent(m_events[SignalEvent]);
	LeaveCriticalSection(&CSMutex);
}

void Condition::SignalAll()
{
	EnterCriticalSection(&CSMutex);
	if(m_waiters > 0)
		SetEvent(m_events[BroadcastEvent]);
	LeaveCriticalSection(&CSMutex);
}

void Condition::Wait()
{
	EnterCriticalSection(&CSMutex);
	
	m_waiters++;
	
	
	LeaveCriticalSection(&CSMutex);
	int result = WaitForMultipleObjects (_eventCount, m_events, FALSE, INFINITE);
	EnterCriticalSection(&CSMutex);
	
	m_waiters--;
	
	//see if we are the last person waiting on the condition, and there was a broadcast
	//if so, we need to reset the broadcast event.
	if(m_waiters == 0 && result == (WAIT_OBJECT_0+BroadcastEvent))
		ResetEvent(m_events[BroadcastEvent]);
	
	LeaveCriticalSection(&CSMutex);
}


#else	//!WIN32

Condition::Condition() 
{
	pthread_cond_init(&cond,NULL);
	pthread_mutex_init(&mutex,NULL);
}

void Condition::Signal()
{
	pthread_mutex_lock(&mutex);
	pthread_cond_signal(&cond);
	pthread_mutex_unlock(&mutex);
}

void Condition::SignalAll()
{
	pthread_mutex_lock(&mutex);
	pthread_cond_broadcast(&cond);
	pthread_mutex_unlock(&mutex);
}

void Condition::Wait()
{
	pthread_mutex_lock(&mutex);
	pthread_cond_wait(&cond,&mutex);
	pthread_mutex_unlock(&mutex);
}

/*
I commented this specifically because I think it might be very
difficult to write a windows counterpart to it, so I would like
to discourage its use until we can confirm that it can be reasonably
implemented on windows.

bool Condition::TimedWait(unsigned long usec)
{
struct timeval now;
struct timespec timeout;
int retcode=0;
	pthread_mutex_lock(&mutex);
	gettimeofday(&now,NULL);
	now.tv_usec+=usec;
	timeout.tv_sec = now.tv_sec + (now.tv_usec/1000000);
	timeout.tv_nsec = (now.tv_usec%1000000) *1000;
	//cout << "now=" << now.tv_sec << "."<<now.tv_usec << endl;
	//cout << "timeout=" << timeout.tv_sec << "."<<timeout.tv_nsec << endl;
	retcode=pthread_cond_timedwait(&cond,&mutex,&timeout);
	pthread_mutex_unlock(&mutex);

	return retcode!=ETIMEDOUT;
}
*/

Condition::~Condition()
{
	pthread_mutex_lock(&mutex);
	pthread_cond_destroy(&cond);
	pthread_mutex_unlock(&mutex);
	pthread_mutex_destroy(&mutex);
}

#endif
